// A Run is the recording: a chat transcript (turns) + asserts + outcome.export class Recorder {  constructor(task, meta = {}) {    this.run = {      task, brain: meta.brain ?? "scripted", meta,      startedAt: Date.now(), turns: [], asserts: [], ok: true,    };    this.run.turns.push({ t: Date.now(), role: "user", text: task });  }  turn(t) { this.run.turns.push({ t: Date.now(), ...t }); }  say(text) { this.turn({ role: "assistant", kind: "reasoning", text }); }  toolCall(name, args, result, ok, text) {    this.turn({ role: "tool", call: { name, args }, result, ok, text });  }  assert(a) {    this.run.asserts.push(a);    this.turn({ role: "assert", ...a });    if (!a.ok) this.run.ok = false;  }  finish(ok, error) {    if (!ok) this.run.ok = false;    this.run.endedAt = Date.now();    this.run.durationMs = this.run.endedAt - this.run.startedAt;    if (error) {      this.run.error = String(error?.message ?? error);      this.turn({ role: "error", text: this.run.error });    }    return this.run;  }}